CA2493754A1 - Liquid crystalline polymer compositions - Google Patents
Liquid crystalline polymer compositions Download PDFInfo
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- CA2493754A1 CA2493754A1 CA002493754A CA2493754A CA2493754A1 CA 2493754 A1 CA2493754 A1 CA 2493754A1 CA 002493754 A CA002493754 A CA 002493754A CA 2493754 A CA2493754 A CA 2493754A CA 2493754 A1 CA2493754 A1 CA 2493754A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/44—Polyester-amides
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- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/542—Macromolecular compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
- H01B3/305—Polyamides or polyesteramides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
- H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0104—Properties and characteristics in general
- H05K2201/0129—Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
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- H05K2201/0141—Liquid crystal polymer [LCP]
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- H05K2201/01—Dielectrics
- H05K2201/0137—Materials
- H05K2201/015—Fluoropolymer, e.g. polytetrafluoroethylene [PTFE]
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- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0203—Fillers and particles
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Abstract
Disclosed are liquid crystalline polymer compositions, which are melt moldable, and which contain a perfluorinated polymer, and a particulate aramid, and optionally contain hollow glass or quartz spheres, and which usually have low dielectric constants. They are particularly useful as electrical connectors and substrates for other electronic applications which use high frequency signals.
Description
LIQUID CRYSTALLINE POLYMER COMPOSITIONS
FIELD OF THE INVENTION
Liquid crystalline polymer compositions containing a perfluorinated polymer, a particulate aramid, and option-ally hollow glass or quartz spheres usually have low di-electric constants, making them useful as substrates for electronic appplication such as electrical connectors, particularly when those applications involve high fre-quncy signals.
TECHNICAL BACKGROUND
Many types of materials are used as substrates for fabricating electrical connectors. One particular prop-erty of these materials, dielectric constant, is impor-tant when dealing with high frequency signals. If the dielectric constant of the substrate is too high, these signals may be attenuated to such a degree that the elec-tronic apparatus does not function as designed. There-fore these substrates, particularly for this type of ap-plication, should have as low a dielectric constant as possible. However complicating this situation is the fact that other properties are also necessary and/or de-sirable in such substrates, such as good strength, resis-tance to high temperatures, good fire resistance, and good formability, etc. Making such compositions is a challenge, since improving one particular property often leads to deterioration of another (desired) property.
Thus such compositions are constantly being sought.
U.S. Patent 5,398,990 describes LCP compositions containing hollow glass spheres and polytetrafluoroethyl-ene. The presence of aramids is not mentioned.
European Patent Application 512,401 describes Cer-tain laminates having low dielectric constants. The resin compositions contain molecularly porous aerogels, not hollow glass or quartz spheres.
Japanese Patent Application 0455437 describes a prepreg material which is made from a fluoroplastic, hol-low glass spheres, and a cloth or paper-like material which can be an aramid. This material may be saturated with a thermosetting resin such as an epoxy resin, but LCPs aren't mentioned.
SUMMARY OF THE INVENTION
This invention concerns a composition, comprising, about 5 to about 25 percent by weight of a particulate aramid, about 5 to about 40 percent by weight of a par-ticulate perfluorinated polymer, 0 to about 15 percent by weight of hollow glass or quartz spheres, and the remain-der a liquid Crytsalline polymer (LCP), wherein percent by weight are based on the total amount of said particu-late aramid, perfluorinated thermoplasctiC, hollow glass or quartz spheres, and liquid crystalline polymer pres-ent.
FIELD OF THE INVENTION
Liquid crystalline polymer compositions containing a perfluorinated polymer, a particulate aramid, and option-ally hollow glass or quartz spheres usually have low di-electric constants, making them useful as substrates for electronic appplication such as electrical connectors, particularly when those applications involve high fre-quncy signals.
TECHNICAL BACKGROUND
Many types of materials are used as substrates for fabricating electrical connectors. One particular prop-erty of these materials, dielectric constant, is impor-tant when dealing with high frequency signals. If the dielectric constant of the substrate is too high, these signals may be attenuated to such a degree that the elec-tronic apparatus does not function as designed. There-fore these substrates, particularly for this type of ap-plication, should have as low a dielectric constant as possible. However complicating this situation is the fact that other properties are also necessary and/or de-sirable in such substrates, such as good strength, resis-tance to high temperatures, good fire resistance, and good formability, etc. Making such compositions is a challenge, since improving one particular property often leads to deterioration of another (desired) property.
Thus such compositions are constantly being sought.
U.S. Patent 5,398,990 describes LCP compositions containing hollow glass spheres and polytetrafluoroethyl-ene. The presence of aramids is not mentioned.
European Patent Application 512,401 describes Cer-tain laminates having low dielectric constants. The resin compositions contain molecularly porous aerogels, not hollow glass or quartz spheres.
Japanese Patent Application 0455437 describes a prepreg material which is made from a fluoroplastic, hol-low glass spheres, and a cloth or paper-like material which can be an aramid. This material may be saturated with a thermosetting resin such as an epoxy resin, but LCPs aren't mentioned.
SUMMARY OF THE INVENTION
This invention concerns a composition, comprising, about 5 to about 25 percent by weight of a particulate aramid, about 5 to about 40 percent by weight of a par-ticulate perfluorinated polymer, 0 to about 15 percent by weight of hollow glass or quartz spheres, and the remain-der a liquid Crytsalline polymer (LCP), wherein percent by weight are based on the total amount of said particu-late aramid, perfluorinated thermoplasctiC, hollow glass or quartz spheres, and liquid crystalline polymer pres-ent.
DETAILS OF THE INVENTION
Herein certain terms are used and some of them are:
By "particulate aramid" is meant aramid particles whose average largest dimension does not exceed 500 ~,, preferably 200 ~,m, and more preferably is less than 100 ~,m. The particles may be of any shape, for example short fibers, fibrils, fibrids, irregular, spherical, disc shaped, etc. The longest dimension for example of a fi-ber, fibril or fibrid will normally be its length. "Par ticulate aramid" also excludes aramids in the form of woven or nonwoven fabrics or aramid papers, even though the "particles" of aramid in any of these types of mate rials meet the size limitations described above. However there may be some adventitious entanglement between par-ticulate aramid particles in the composition, formed when the composition is melt molded.
By a "perfluorinated" polymer is meant a polymer which does not contain any.hydrogen in a repeat unit, but may contain traces of hydrogen, for example in end groups.
By a "thermoplastic" is meant a polymer which has a melting point or glass transition temperature above 30°C, preferably above 60°C. For a melting point to be effective for this criterion, the heat of melting should be at least 2 J/g for a polymer which is not liquid crys-talline.
By a "liquid crystalline polymer" is meant a polymer that is anisotropic when tested using the TOT
test or any reasonable variation thereof, as described in U.S. Patent 4,118,372, which is hereby included by refer-ence.
Herein certain terms are used and some of them are:
By "particulate aramid" is meant aramid particles whose average largest dimension does not exceed 500 ~,, preferably 200 ~,m, and more preferably is less than 100 ~,m. The particles may be of any shape, for example short fibers, fibrils, fibrids, irregular, spherical, disc shaped, etc. The longest dimension for example of a fi-ber, fibril or fibrid will normally be its length. "Par ticulate aramid" also excludes aramids in the form of woven or nonwoven fabrics or aramid papers, even though the "particles" of aramid in any of these types of mate rials meet the size limitations described above. However there may be some adventitious entanglement between par-ticulate aramid particles in the composition, formed when the composition is melt molded.
By a "perfluorinated" polymer is meant a polymer which does not contain any.hydrogen in a repeat unit, but may contain traces of hydrogen, for example in end groups.
By a "thermoplastic" is meant a polymer which has a melting point or glass transition temperature above 30°C, preferably above 60°C. For a melting point to be effective for this criterion, the heat of melting should be at least 2 J/g for a polymer which is not liquid crys-talline.
By a "liquid crystalline polymer" is meant a polymer that is anisotropic when tested using the TOT
test or any reasonable variation thereof, as described in U.S. Patent 4,118,372, which is hereby included by refer-ence.
Preferably the perfluorinated polymer is present in the amount of about 10 to about 30 percent by weight. It is typically added as a particulate material to the other ingredients of the composition, to help assure uniform S distribution of the various ingredients. Preferred per-fluorinated polymers include the homo- and copolymers of tetrafluoroethylene (TFE). Specific preferred perfluori-nated polymers include polytetrafluoroethylene (PTFE), a copolymer of TFE and hexafluoropropylene, and a copolymer of TFE and perfluoro(methyl vinyl ether). PTFE is an es-pecially preferred perfluorinated polymer. PTFE is available as a fine powder from manufacture of PTFE aque-ous dispersions, and such fine powders are useful for making the present compositions. Although PTFE is diffi-cult to melt process for the purposes herein it is con-sidered a thermoplastic. It is preferred that the per-fluorinated polymer is a thermoplastic.
Hollow glass and quartz (micro),spheres, suitable for use herein, are available commercially from companies such as 3M Co., St. Paul, MN, USA, and PQ Corp., Valley Forge, PA, USA. They typically have diameters of about 20 ~,m to about 75 ~,m. It is preferred that their concen-tration in the composition is 0 to about 10 percent by weight. Quartz is a preferred material for the hollow microspheres. The spheres may be coated with an adhesion promoter such as a functional silane adhesion promoter to (nominally) improve adhesion between the spheres and the LCP.
Preferably the particulate aramid is about 8 to about 22 weight percent of the composition. All preferred percentages by weight herein are based on the total weight of named ingredients (as in claim 1), and any pre-ferred percentage by weight may be combined with any other (preferred) percentage by weight.
Hollow glass and quartz (micro),spheres, suitable for use herein, are available commercially from companies such as 3M Co., St. Paul, MN, USA, and PQ Corp., Valley Forge, PA, USA. They typically have diameters of about 20 ~,m to about 75 ~,m. It is preferred that their concen-tration in the composition is 0 to about 10 percent by weight. Quartz is a preferred material for the hollow microspheres. The spheres may be coated with an adhesion promoter such as a functional silane adhesion promoter to (nominally) improve adhesion between the spheres and the LCP.
Preferably the particulate aramid is about 8 to about 22 weight percent of the composition. All preferred percentages by weight herein are based on the total weight of named ingredients (as in claim 1), and any pre-ferred percentage by weight may be combined with any other (preferred) percentage by weight.
Preferably the particulate aramid is a "powder"
grade. Such grades contain particles which for the most part are not fiber-like or fibrillar-like. The aramid powder usually has a surface area of 2 m~/g or less, often 0.2 m2/g or less. It may be prepared by grinding the aramid, see for instance U.S. Patents 5,474,&2 and 5,811,042, and Research Disclosure, May 1996, p. 293.
Preferably the particle size is such that at least 90 percent by weight, more preferably 95 percent by weight of the powder passes through a No. 100 (150 ~.m) screen when tested according to ASTM Method D-1921-Ol, Test Method B. A composition containing a thermotropic LCP
and powdered aramid has exceptionally good (improved) physical properties, such as tensile and flexural proper-ties. A preferred aramid for the powder or any other particulate aramid form is polyp-phenylene tereph-thalamide).
The compositions described herein can be made using typical thermoplastic mixing 'and processing techniques.
For~example all of the ingredients can be fed to a single or twin screw extruder (the ingredients do not have to be fed simultaneously or at the same place in the extruder), and using the mechanical action and/or heaters of the ex-truder the LCP, and optionally the perfluorinated poly-mer, are melted and mixed with the other ingredients.
Preferably the composition formed should be relatively uniform, with the aramid particles, glass or quartz spheres and perfluorinated polymer being reasonably uni-formly dispersed in the LCP.
The LCP is typically present as a continuous phase in the composition. The perfluorinated polymer and/or aramid are preferably present as discontinuous phases within the LCP continuous phase.
grade. Such grades contain particles which for the most part are not fiber-like or fibrillar-like. The aramid powder usually has a surface area of 2 m~/g or less, often 0.2 m2/g or less. It may be prepared by grinding the aramid, see for instance U.S. Patents 5,474,&2 and 5,811,042, and Research Disclosure, May 1996, p. 293.
Preferably the particle size is such that at least 90 percent by weight, more preferably 95 percent by weight of the powder passes through a No. 100 (150 ~.m) screen when tested according to ASTM Method D-1921-Ol, Test Method B. A composition containing a thermotropic LCP
and powdered aramid has exceptionally good (improved) physical properties, such as tensile and flexural proper-ties. A preferred aramid for the powder or any other particulate aramid form is polyp-phenylene tereph-thalamide).
The compositions described herein can be made using typical thermoplastic mixing 'and processing techniques.
For~example all of the ingredients can be fed to a single or twin screw extruder (the ingredients do not have to be fed simultaneously or at the same place in the extruder), and using the mechanical action and/or heaters of the ex-truder the LCP, and optionally the perfluorinated poly-mer, are melted and mixed with the other ingredients.
Preferably the composition formed should be relatively uniform, with the aramid particles, glass or quartz spheres and perfluorinated polymer being reasonably uni-formly dispersed in the LCP.
The LCP is typically present as a continuous phase in the composition. The perfluorinated polymer and/or aramid are preferably present as discontinuous phases within the LCP continuous phase.
Other ingredients, such as those typically used in thermoplastic compositions, may also be present, particu-larly in small quantities. Such ingredients include fillers and reinforcing agents, pigments, dyes, antioxi-dams, lubricants, and nucleating agents. Preferably these other ingredients should not deleteriously signifi-cantly affect the important properties of the composi-tion.
Typically the compositions of the present invention may be melt molded, while having lower dielectric con-stants (particularly at higher frequencies such as 5 GHz) than other typical LCP compositions, while maintaining other reasonable physical properties, for example tensile strength and elongation, and flexural strength and elon-gation. They often also have good flammability resis-tance, for example having a UL-94 rating of V-0 at 1.59 mm (1/16") thickness. This make them particularly useful in electrical or electronic parts such as electrical con-nectors where the reduced dielectric constant permits rapid passage with low.parasitic losses in high frequency applications, and their strength properties are suffi-cient for this application. Melt.molding can be carried out conventional techniques such as injection molding, extrusion, etc.
Herein certain properties are measured as follows:
Melting point and glass transition temperature are measured by method ASTM Method D3418. Melting points are taken as the temperature at the peak of the melting endotherm, and glass transition temperatures are taken as the midpoint of the transition. Melting points and glass transition temperatures are measured on the second heat, using a heating rate of 25°C/min. If more than one melt-ing point is present the melting point of the polymer is taken as the highest of the melting points. Heats of fu-lion are taken as the area under the melting endotherm.
Dielectric constant (e'), dielectric loss (e"), and loss tangent (e"/e') are determined by ASTM Method D-150.
In the Examples tensile strength and tensile elongation to break were determined using ASTM Method D-638 (using strain gauges), flexural modulus and flexural strength were determined by ASTM Method D-790, and Heat Deflection Temperature (HDT) was determined by ASTM
Method D648 at a 1.82 MPa load. Electrical properties were measured by ASTM Method D-257.
In the Examples the following LCPs were used (all ratios given are in molar parts):
A - hydroquinone 50; 4,4'-biphenol 50; tereph-thalic acid 70; 2,6-naphthalene dicarboxylic acid 30; 4-hydroxybenzoic acid 320.
B - hydroquinone 5o-; 4,4'-biphenol 50; tereph-thalic acid 85; 2,6-naphthalene dicarboxylic acid 15; 4-hydroxybenzoic acid 320.
C - hydroquinone 50; 4,4'-biphenol 50; tereph-thalic acid 87.5; 2,6-naphthalene dicarboxylic acid 12.5;
4-hydroxybenzoic acid 320, which also contains 25 ppm of potassium ion.
Typically the compositions of the present invention may be melt molded, while having lower dielectric con-stants (particularly at higher frequencies such as 5 GHz) than other typical LCP compositions, while maintaining other reasonable physical properties, for example tensile strength and elongation, and flexural strength and elon-gation. They often also have good flammability resis-tance, for example having a UL-94 rating of V-0 at 1.59 mm (1/16") thickness. This make them particularly useful in electrical or electronic parts such as electrical con-nectors where the reduced dielectric constant permits rapid passage with low.parasitic losses in high frequency applications, and their strength properties are suffi-cient for this application. Melt.molding can be carried out conventional techniques such as injection molding, extrusion, etc.
Herein certain properties are measured as follows:
Melting point and glass transition temperature are measured by method ASTM Method D3418. Melting points are taken as the temperature at the peak of the melting endotherm, and glass transition temperatures are taken as the midpoint of the transition. Melting points and glass transition temperatures are measured on the second heat, using a heating rate of 25°C/min. If more than one melt-ing point is present the melting point of the polymer is taken as the highest of the melting points. Heats of fu-lion are taken as the area under the melting endotherm.
Dielectric constant (e'), dielectric loss (e"), and loss tangent (e"/e') are determined by ASTM Method D-150.
In the Examples tensile strength and tensile elongation to break were determined using ASTM Method D-638 (using strain gauges), flexural modulus and flexural strength were determined by ASTM Method D-790, and Heat Deflection Temperature (HDT) was determined by ASTM
Method D648 at a 1.82 MPa load. Electrical properties were measured by ASTM Method D-257.
In the Examples the following LCPs were used (all ratios given are in molar parts):
A - hydroquinone 50; 4,4'-biphenol 50; tereph-thalic acid 70; 2,6-naphthalene dicarboxylic acid 30; 4-hydroxybenzoic acid 320.
B - hydroquinone 5o-; 4,4'-biphenol 50; tereph-thalic acid 85; 2,6-naphthalene dicarboxylic acid 15; 4-hydroxybenzoic acid 320.
C - hydroquinone 50; 4,4'-biphenol 50; tereph-thalic acid 87.5; 2,6-naphthalene dicarboxylic acid 12.5;
4-hydroxybenzoic acid 320, which also contains 25 ppm of potassium ion.
The LCPs are made by procedures described in U.S.
Patents 5,110,896 and 5,397,502, both of which are hereby included by reference.
Examples 1-8 Liquid crystalline polymers, designated A, B or C
were compounded with 10 weight percent (20 weight percent in Example 4) Kevlar~ Aramid Resin, Type # 8120, or TO
weight percent 1.5 mm long Kevlar~ cut floc (Example 7 and 8) (both available from E.I. DuPont de Nemours & Co., Wilmington, DE, USA), 10 weight percent hollow glass spheres (3M~ Scotchlite~ Glass Bubbles, Grade 522, avail-able from the 3M Co., St Paul, MN, USA), 20 weight per-cent Teflon° powder sold commercially by DuPont under the trade name of MP 1200 Powder, 0.25 weight percent tereph-thalic acid (Example 1 only), and 0.20 weight percent PE
190 polyethylene wax (sold Jay Clariant Corp, Charlotte, NC). The remainder of the material was the liquid crys-talline polymer. All materials except the Kevlar~ powder or 'floc and hollow glass spheres were fed through the feed zone of a 30 mm bilobal twin screw extruder manufac-tured by Werner & Pfleiderer (Stuttgart, Germany). Screw RPM was set at 250. The resulting compounded products were molded into 15.2 cm x15.2 cm x 0.16 cm plaques (electrically heated mold) using a 6 oz. HPM molding ma-chine and the following molding conditions: barrel tem-peratures 350°C, 110°C mold temperature, boost time 2 sec, injection time 10 sec, hold time 15 sec, boost pressure 4.8 MPa, injection pressure 3.5 MPa, screw speed 120 RPM.
The plaques were tested for high frequency electri-cal properties, and these properties, and the polymer type used in each Example are given 'in Table 1.
Patents 5,110,896 and 5,397,502, both of which are hereby included by reference.
Examples 1-8 Liquid crystalline polymers, designated A, B or C
were compounded with 10 weight percent (20 weight percent in Example 4) Kevlar~ Aramid Resin, Type # 8120, or TO
weight percent 1.5 mm long Kevlar~ cut floc (Example 7 and 8) (both available from E.I. DuPont de Nemours & Co., Wilmington, DE, USA), 10 weight percent hollow glass spheres (3M~ Scotchlite~ Glass Bubbles, Grade 522, avail-able from the 3M Co., St Paul, MN, USA), 20 weight per-cent Teflon° powder sold commercially by DuPont under the trade name of MP 1200 Powder, 0.25 weight percent tereph-thalic acid (Example 1 only), and 0.20 weight percent PE
190 polyethylene wax (sold Jay Clariant Corp, Charlotte, NC). The remainder of the material was the liquid crys-talline polymer. All materials except the Kevlar~ powder or 'floc and hollow glass spheres were fed through the feed zone of a 30 mm bilobal twin screw extruder manufac-tured by Werner & Pfleiderer (Stuttgart, Germany). Screw RPM was set at 250. The resulting compounded products were molded into 15.2 cm x15.2 cm x 0.16 cm plaques (electrically heated mold) using a 6 oz. HPM molding ma-chine and the following molding conditions: barrel tem-peratures 350°C, 110°C mold temperature, boost time 2 sec, injection time 10 sec, hold time 15 sec, boost pressure 4.8 MPa, injection pressure 3.5 MPa, screw speed 120 RPM.
The plaques were tested for high frequency electri-cal properties, and these properties, and the polymer type used in each Example are given 'in Table 1.
In addition to the electrical properties, physicals were measured for the polymer of example 8 after extru-sion into tensile bars. These physical properties are summarized below:
Tensile Strength/Tensile Elongation to break =
66.9 MPa/2.42%
Flex Modulus/Flex Strength 4.70 GPa/86.9 MPa UL-94 burn times on 0.16 cm thick bars (time/rating) /HDT = (18.3 sec/V-0) / 250°C
Comparative Examples A-D
Liquid crystalline polymer A was compounded with (percentages are weight percents) Comparative Examples A and B - with 30 percent glass fiber, 0.20 weight percent PE 190, and 5o Ti02 Comparative Examples C and D - Same as A and B ex-cept 30 percent glass fiber replaced with 30 percent talc These compositions were molded into plaques and tested for high frequency electrical properties. The properties are given in Table 1.
Table 1 Example LCP Sample Frequency,DielectricDielectricLoss Thickness,GHz Constant,Loss Tangent, cm D!C Coef- a"/e', ficient,DF
e"
1 C 0.15 5.2270 2.9130 0.0107 0.0037 2 C 0.16 5.2130 2.9900 0.0106 0.0035 3 A 0.17 5.1980 2.9550 0.0110 0.0037 4 C 0.16 5.2150 2.9670 0.0130 0.0044 5 B 0.16 5.2120 2.9690 0.0104 0.0035 6 A 0.17 5.206 2.974 0.0111 0.0038 7 A 0.16 5.176 3.372 0.0102 0.003 8 A 0.16 5.177 3.394 0.0104 0.0031 A A 0.16 5.082 4.147 0.0202 0.0049 B A 0.17 5.071 4.151 0.0197 0.0047 C A 0.16 5.146 3.701 0.0067 0.0018 D A 0.15 5.148 3.724 0.007 0.0019 Example 6 the average of 2 plaques.
Tensile Strength/Tensile Elongation to break =
66.9 MPa/2.42%
Flex Modulus/Flex Strength 4.70 GPa/86.9 MPa UL-94 burn times on 0.16 cm thick bars (time/rating) /HDT = (18.3 sec/V-0) / 250°C
Comparative Examples A-D
Liquid crystalline polymer A was compounded with (percentages are weight percents) Comparative Examples A and B - with 30 percent glass fiber, 0.20 weight percent PE 190, and 5o Ti02 Comparative Examples C and D - Same as A and B ex-cept 30 percent glass fiber replaced with 30 percent talc These compositions were molded into plaques and tested for high frequency electrical properties. The properties are given in Table 1.
Table 1 Example LCP Sample Frequency,DielectricDielectricLoss Thickness,GHz Constant,Loss Tangent, cm D!C Coef- a"/e', ficient,DF
e"
1 C 0.15 5.2270 2.9130 0.0107 0.0037 2 C 0.16 5.2130 2.9900 0.0106 0.0035 3 A 0.17 5.1980 2.9550 0.0110 0.0037 4 C 0.16 5.2150 2.9670 0.0130 0.0044 5 B 0.16 5.2120 2.9690 0.0104 0.0035 6 A 0.17 5.206 2.974 0.0111 0.0038 7 A 0.16 5.176 3.372 0.0102 0.003 8 A 0.16 5.177 3.394 0.0104 0.0031 A A 0.16 5.082 4.147 0.0202 0.0049 B A 0.17 5.071 4.151 0.0197 0.0047 C A 0.16 5.146 3.701 0.0067 0.0018 D A 0.15 5.148 3.724 0.007 0.0019 Example 6 the average of 2 plaques.
Claims (15)
1. A composition, comprising, about 5 to about 25 percent by weight of a particulate aramid, about 5 to about 40 percent by weight of a particulate perfluori-nated polymer, 0 to about 15 percent by weight of hollow glass or quartz spheres, and the remainder a liquid cryt-salline polymer, wherein percent by weight is based on the total amount of said particulate aramid, perfluori-nated thermoplasctic, hollow glass or quartz spheres, and liquid crystalline polymer present.
2. The composition of claim 1 wherein said particu-late aramid is an aramid powder.
3. The composition of claim 1 wherein about 10 to about 30 weight percent of said perfluorinated polymer is present.
4. The composition of claim 1 wherein said per-fluorinated polymer is a homo- or copolymer of tetra-fluoroethylene.
5. The composition of claim 1 wherein 0 to about 10 weight percent of said hollow glass or quartz spheres are present.
6. The composition of claim 1 wherein about 8 to about 22 percent by weight of said particulate aramid is present.
7. The composition of claim 2 wherein said particu-late aramid is poly(p-phenylene terephthalamide).
8. The composition of claim 1 wherein about 10 to about 30 weight percent of said perfluorinated polymer is present, wherein 0 to about 10 weight percent of said hollow glass or quartz spheres are present, and about 8 to about 22 percent by weight of said particulate aramid is present.
9. The composition of claim 2 wherein said particu-late aramid is poly(p-phenylene terephthalamide).
10. An electrical or electronic part comprising the composition of claim 1.
11. An electrical connector comprising the composi-tion of claim 1.
12. An electrical or electronic part comprising the composition of claim 8.
13. An electrical connector comprising the composi-tion of claim 8.
14. An electrical or electronic part comprising the composition of claim 2.
15. An electrical or electronic part comprising the composition of claim 9.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US39871002P | 2002-07-25 | 2002-07-25 | |
US60/398,710 | 2002-07-25 | ||
PCT/US2003/023225 WO2004011526A1 (en) | 2002-07-25 | 2003-07-23 | Liquid crystalline polymer compositions |
Publications (1)
Publication Number | Publication Date |
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CA2493754A1 true CA2493754A1 (en) | 2004-02-05 |
Family
ID=31188460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA002493754A Abandoned CA2493754A1 (en) | 2002-07-25 | 2003-07-23 | Liquid crystalline polymer compositions |
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US (1) | US7128847B2 (en) |
EP (1) | EP1527121B1 (en) |
JP (1) | JP4425790B2 (en) |
KR (1) | KR20050025991A (en) |
CN (1) | CN1294207C (en) |
AU (1) | AU2003256774A1 (en) |
CA (1) | CA2493754A1 (en) |
DE (1) | DE60305926T2 (en) |
WO (1) | WO2004011526A1 (en) |
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US7744802B2 (en) * | 2004-06-25 | 2010-06-29 | Intel Corporation | Dielectric film with low coefficient of thermal expansion (CTE) using liquid crystalline resin |
JP2006045517A (en) * | 2004-06-30 | 2006-02-16 | Sumitomo Chemical Co Ltd | Film |
KR101148384B1 (en) * | 2009-11-26 | 2012-05-21 | 삼성전기주식회사 | Composition for forming substrate, and prepreg and substrate using the same |
JP2015522086A (en) * | 2012-06-27 | 2015-08-03 | ティコナ・エルエルシー | Ultra-low viscosity liquid crystalline polymer composition |
CN108882515A (en) * | 2018-09-21 | 2018-11-23 | 维沃移动通信有限公司 | The processing method and mobile terminal of a kind of signal transmission device part, signal transmission device part |
JP2021109891A (en) * | 2020-01-07 | 2021-08-02 | パナソニックIpマネジメント株式会社 | Liquid crystalline resin composition and molded article |
JP2021147476A (en) * | 2020-03-18 | 2021-09-27 | Eneos株式会社 | Resin composition and resin molded article composed of the resin composition |
CN113930084B (en) * | 2021-09-18 | 2024-05-07 | 珠海万通特种工程塑料有限公司 | Liquid crystal polymer composition and application thereof |
WO2023127734A1 (en) * | 2021-12-28 | 2023-07-06 | 住友化学株式会社 | Resin composition and molded body |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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US525700A (en) * | 1894-09-11 | Attachment for stone-working machines | ||
PH15509A (en) | 1974-05-10 | 1983-02-03 | Du Pont | Improvements in an relating to synthetic polyesters |
JPH0455437A (en) * | 1990-06-26 | 1992-02-24 | Matsushita Electric Works Ltd | Prepreg for laminated board with low dielectric constant |
US5466744A (en) | 1990-11-05 | 1995-11-14 | General Electric Company | Polymerization of macrocyclic poly(alkylene dicarboxylate) oligomers |
US5110896A (en) | 1990-12-10 | 1992-05-05 | E. I. Du Pont De Nemours And Company | Thermotropic liquid crystalline polyester compositions |
JPH0799646B2 (en) | 1991-05-03 | 1995-10-25 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Low dielectric constant composite laminates filled with molecularly porous airgel |
US5474842A (en) * | 1991-08-20 | 1995-12-12 | Hoiness; David E. | Aramid particles as wear additives |
US5348990A (en) | 1993-03-02 | 1994-09-20 | Hoechst Celanese Corp. | Low dielectric materials |
CA2162852C (en) | 1993-05-14 | 2004-11-09 | Michael Robert Samuels | Liquid crystalline polymer compositions |
US5397502A (en) | 1993-06-10 | 1995-03-14 | E. I. Du Pont De Nemours And Company | Heat resistant liquid crsytalline polymers |
CN1085684C (en) * | 1996-01-05 | 2002-05-29 | 纳幕尔杜邦公司 | Liquid crystalline polymer composition |
CA2234317C (en) | 1997-04-08 | 2008-06-17 | Sumitomo Chemical Co., Ltd. | Composite film comprising low-dielectric resin and para-oriented aromatic polyamide |
US6388202B1 (en) * | 1997-10-06 | 2002-05-14 | Motorola, Inc. | Multi layer printed circuit board |
US6294618B1 (en) | 1998-04-09 | 2001-09-25 | E. I. Du Pont De Nemours And Company | Low viscosity liquid crystalline polymer compositions |
EP1246867A1 (en) * | 2000-01-13 | 2002-10-09 | E.I. Dupont De Nemours And Company | Liquid crystalline polymer compositions containing small particle size fillers |
-
2003
- 2003-07-10 US US10/617,117 patent/US7128847B2/en not_active Expired - Fee Related
- 2003-07-23 DE DE60305926T patent/DE60305926T2/en not_active Expired - Lifetime
- 2003-07-23 CA CA002493754A patent/CA2493754A1/en not_active Abandoned
- 2003-07-23 KR KR1020057001280A patent/KR20050025991A/en not_active Application Discontinuation
- 2003-07-23 WO PCT/US2003/023225 patent/WO2004011526A1/en active IP Right Grant
- 2003-07-23 JP JP2004524795A patent/JP4425790B2/en not_active Expired - Fee Related
- 2003-07-23 CN CNB038178397A patent/CN1294207C/en not_active Expired - Lifetime
- 2003-07-23 AU AU2003256774A patent/AU2003256774A1/en not_active Abandoned
- 2003-07-23 EP EP03771815A patent/EP1527121B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP4425790B2 (en) | 2010-03-03 |
DE60305926T2 (en) | 2007-01-25 |
KR20050025991A (en) | 2005-03-14 |
DE60305926D1 (en) | 2006-07-20 |
CN1294207C (en) | 2007-01-10 |
EP1527121A1 (en) | 2005-05-04 |
US20040056233A1 (en) | 2004-03-25 |
JP2005533908A (en) | 2005-11-10 |
AU2003256774A1 (en) | 2004-02-16 |
US7128847B2 (en) | 2006-10-31 |
WO2004011526A1 (en) | 2004-02-05 |
EP1527121B1 (en) | 2006-06-07 |
CN1671770A (en) | 2005-09-21 |
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